IEEE C802.16m-09/1178
Project
IEEE 802.16 Broadband Wireless Access Working Group <http://ieee802.org/16>
Title
Network Entry Harmonization
Date
Submitted
2009-05-06
Source(s)
Jungje Son, YoungKyo Baek, Jicheol Lee
Jicheol.lee@samsung.com
Samsung Electronics Co., Ltd.
Kelvin Chou
MediaTek Inc.
Kevin Power
Fujitsu
Kiseon
LGE
Chun-Yen Hsu
III
Yuqin Chen
ZTE
Re:
“802.16m AWD”:
IEEE 802.16m-09/0020, “Call for Contributions on Project 802.16m Amendment Working
Document (AWD) Content”.
Target topic: “Network entry”.
Abstract
The contribution proposes the text of security section to be included in the 802.16m amendment
working document.
Purpose
To be discussed and adopted by TGm for 802.16m amendment working document.
Notice
Release
Patent
Policy
This document does not represent the agreed views of the IEEE 802.16 Working Group or any of its subgroups. It
represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion.
It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein.
The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution,
and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any
IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion
to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also
acknowledges and accepts that this contribution may be made public by IEEE 802.16.
The contributor is familiar with the IEEE-SA Patent Policy and Procedures:
<http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and
<http://standards.ieee.org/guides/opman/sect6.html#6.3>.
Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and
<http://standards.ieee.org/board/pat>.
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IEEE C802.16m-09/1178
Proposed Text of Network entry Section
for the IEEE 802.16m AWD
1. Text proposal for inclusion in the 802.16m amendment working document
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Text Start
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15.2.x Network Entry and Initialization
Systems shall support the applicable procedures for entering and registering a new AMS or a new node to the
network. The procedure for initialization of an AMS shall be as shown in Figure XX1. This figure shows the
overall flow between the stages of initialization in an AMS.
Figure. XX1 network entry state machine - AMS side
The procedure can be divided into the following phases:
a) Scan for DL channel and establish synchronization with the ABS
b) Obtain UL parameters (from SuperFrameHeader)
c) Perform ranging
d) Negotiate Pre-authentication capability
e) Authorize AMS and perform key exchange
f) Perform Capability exchange and registration, and setup default service flow.
During network entry, ABS may allocate an UL bandwidth for transmission or retransmission of MAC
messages without a bandwidth request from AMS.
Each AMS contains the following information when shipped from the manufacturer:
— A 48-bit universal MAC address (per IEEE Std 802-2001) assigned during the manufacturing process. This
is used to identify the SS to the various provisioning servers during initialization.
— Security information as defined in Clause 7 (e.g., X.509 certificate) used to authenticate the AMS to the
security server and authenticate the responses from the security and provisioning servers.
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IEEE C802.16m-09/1178
15.2.x.1 AMS synchronization.
On initialization or after signal loss, the AMS shall acquire a DL channel. Once the PHY has achieved
synchronization, as given by a PHY Indication, the MAC shall attempt to acquire the channel control
parameters for the DL and then the UL.
15.2.x.2 AMS obtaining DL/UL parameters
15.2.x.2.1 Establishment of DL Synchronization
To establish the DL synchronization the AMS shall perform the following operations:

Scan the air interface and synchronize to the ABS

Acquire network parameters and select the network

Acquire DL parameters
On initialization or after signal loss, the AMS shall acquire the DL synchronization. The AMS shall have
nonvolatile storage in which the last operational parameters are stored and may first try to reacquire the stored
DL channel. If the aforementioned process fails, the AMS shall begin to scan the possible channels of the DL
frequency band of operation until it finds a valid DL signal. The operational block diagram for establishment of
DL synchronization is reported in Figure XX2.
The AMS shall synchronize at PHY level through the A-PREAMBLE. The detailed procedure for PHY
synchronization is reported in section 15.3.6.1. Once the AMS has achieved PHY synchronization, the AMS
shall attempt to decode P-SFH and the first SP of the S-SFH. The AMS shall firstly process network related
information, transmitted in the S-SFH, such as Operator ID and NSP ID. Based on the network information, the
AMS shall decide whether to continue the network entry process or to scan for another ABS.
After decoding the network information, the AMS shall process all the relevant downlink parameters
transmitted in the SFH [TBD]. After these steps the DL synchronization with the ABS is established.
The procedure to maintain the DL synchronization is TBD.
Figure XX2. DL Synchronization procedure.
15.2.x.2.2 Acquire UL parameters
After DL synchronization, the AMS shall wait for the S-SFH SPs from the ABS in order to retrieve a set of
transmission parameters for a possible UL channel as indicated in Section 15.3.5.1. These messages are
transmitted periodically within the S-SFH from the ABS. The process of obtaining UL parameters is illustrated
in Figure XX3.
Figure XX3. UL Parameter acquisition.
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IEEE C802.16m-09/1178
15.2.x.3 Initial ranging and automatic adjustments
Ranging is the process of acquiring the correct timing offset, frequency offset and power adjustments so that the
AMS’s transmissions are aligned with the ABS receive frame, and received within the appropriate reception
thresholds. The timing delays through the PHY shall be relatively constant. Any variation in the PHY delays
shall be accounted for in the guard time of the UL PHY overhead.
15.2.x.3.1 Contention-based initial ranging and automatic adjustments.
An AMS that wishes to perform initial ranging shall take the following steps:
— The AMS, after acquiring downlink synchronization and uplink transmission parameters, shall select one
Ranging Slot using the random backoff. The random backoff shall use a binary truncated exponent algorithm.
After selecting the Ranging Slot, the AMS shall choose a ranging sequence (from the Initial Ranging domain)
using a uniform random process. The selected ranging sequence is sent to the ABS in the selected Ranging Slot.
— The ABS should respond with an indication message(TBD) in a predefined, subsequent DL subframe. Each
bit of Decoding Status Bitmap field corresponds to one initial ranging slot in a previous UL subframe. If the
AMS finds in the status indication message that no initial ranging sequence has been successfully decoded in
the ranging slot selected by the AMS, the AMS considers its ranging request is failed and restarts the initial
ranging procedure.
— Upon successfully receiving a CDMA ranging sequence, the ABS broadcasts a AAI_RNG-RSP message.
AAI_RNG-RSP message can belinked to the corresponding bit of the decoding status bitmap. The
AAI_RNG-RSP message contains all the needed adjustment (e.g., time, power, and possibly frequency
corrections) and a status notification.
— Upon receiving a AAI_RNG-RSP message with Continue status, the AMS shall continue the ranging process
as done on the first entry (using random selection rather than random backoff) with ranging sequences randomly
chosen from the initial ranging domain sent on the periodic ranging region.
— When the ABS receives an initial-ranging CDMA code that requires no corrections, the ABS shall provide
BW allocation for the AMS to send the AAI_RNG-REQ message. Sending the AAI_RNG-RSP message with
status “Success” is optional.
— Initial ranging process is over after receiving AAI_RNG-RSP message, which includes a TSTID (temporay
station ID) to be used until STID is received at successful registration.(following a AAI_RNG-REQ
transmission).
—
— The timeout required for AMS to wait for AAI_RNG-RSP, following or not following CDMA Allocation
A-MAP IE, is defined by T3(TBD).
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IEEE C802.16m-09/1178
The message sequence chart (Table xx1) defines the CDMA initial ranging and adjustment process that shall be
followed by compliant AMSs and ABSs.
15.2.x.4 Negotiate Pre-authentication capability.
Immediately after completion of ranging, the AMS informs the ABS of its pre-authentication capabilities by
transmitting an AAI-SBC-REQ message with its capabilities set to “on”. The ABS responds with an
AAI-SBC-RSP message with the intersection of the AMS’s and the ABS’s pre-authentication capabilities set to
“on”. Among the parameters for pre-authentication capability from AMS, if AMS follows default value, the
AMS may omit those parameters from AAI-SBC-REQ. If AMS omits some parameters, the ABS consider
AMS follows the default value for those parameters and ABS may omits those parameters applying default
value in its AAI-SBC-RSP.
15.2.x.5 AMS authorization and key exchange.
If PKM is enabled in pre-authentication capability negotiation, the ABS and AMS shall perform authorization
and key exchange as described in 15.2.3. If this procedure completes successfully, all parameters for TEK
generation are shared, and TEKs are derived at each side of AMS and ABS.
15.2.x.6 Capability exchange and registration.
After authorization and key exchange are finished, the AMS informs the ABS of its capabilities and requests the
registration for entry into the network by AAI-REG-REQ. If an ABS receives an AAI-REG-REQ, the ABS
shall respond with AAI-REG-RSP.
In AAI-REG-REQ, the AMS informs the ABS of its capabilities except pre-authentication capabilities with its
capabilities set to “on”. In AAI-REG-RSP, the ABS responds with the intersection of the AMS’s and the ABS’s
capabilities set to “on”. Among the parameters for capability from AMS, if AMS follows default value, the
AMS may omit those parameters from AAI-REG-REQ. If AMS omits some parameters, the ABS consider
AMS follows the default value for those parameters and ABS may omits those parameters applying default
value in its AAI-REG-RSP.
ABS shall allocate and transfer a STID to the AMS through AAI-REG-RSP message in secure manner and the
temporary STID, which is allocated during initial ranging procedure, is discarded.
If the registration is successful,
a flow ID for default service flow is assigned to MS.
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